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Diodes Incorporated 1N4448WSF-7
- Part No.:
- 1N4448WSF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
1N4448WSF-7.pdf
- Description:
- DIODE GEN PURP 75V 500MA SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:22,669
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Product details
Overview
1N4448WSF-7 from Diodes Incorporated is a surface-mount fast-switching silicon signal diode in SOD323F package, rated for 75 V peak repetitive reverse voltage, 500 mA forward surge current, and 4.0 ns reverse recovery time; used in high-speed clamping, waveform shaping, and logic-level translation circuits in automotive infotainment power supplies.
For engineers reviewing the 1N4448WSF-7 datasheet, 1N4448WSF-7 pinout, 1N4448WSF-7 application, or 1N4448WSF-7 equivalent, key selection criteria include trr ≤ 4.0 ns, CT ≤ 4.0 pF at 1 MHz, IR ≤ 25 nA at 20 V, VF = 0.62–0.72 V @ 5 mA, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This diode operates as a unidirectional switching element with low junction capacitance and nanosecond-scale reverse recovery, enabling clean signal edge handling in digital timing paths and ESD-protected I/O interfaces. Its flat-lead SOD323F construction provides enhanced thermal dissipation over standard SOD-323.
The device meets AEC-Q101 stress test requirements for temperature cycling, humidity bias, and high-temperature operating life, confirming suitability for under-hood automotive modules where ambient temperatures reach +125°C and long-term parametric stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Recovery Time (trr) | ≤ 4.0 ns - enables reliable operation in >100 MHz digital switching and pulse clipping applications |
| Peak Repetitive Reverse Voltage (VRRM) | 75 V - supports rail-to-rail clamping in 5 V/12 V logic and sensor interface circuits |
| Forward Voltage (VF) | 0.62–0.72 V @ 5 mA - minimizes conduction loss in low-power signal routing and level-shifting networks |
| Total Capacitance (CT) | ≤ 4.0 pF @ VR = 0 V, f = 1 MHz - preserves signal integrity in RF detector and high-frequency sampling circuits |
| Leakage Current (IR) | ≤ 25 nA @ VR = 20 V - ensures negligible standby current in battery-backed real-time clock and memory backup paths |
| Thermal Resistance (RθJA) | 313 °C/W - requires minimal PCB copper area for thermal management in space-constrained SMT layouts |
Pinout & Package
Package: SOD323F - ultra-compact surface-mount plastic case (1.25 mm × 1.70 mm × 0.71 mm), flat leadframe for improved heat transfer, matte tin-plated copper alloy terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential node in clamping or protection circuitry; soldered to inner-layer trace for thermal relief |
| Cathode (marked by band) | Current exit point; defines polarity-sensitive connection | Terminates at IC input or supply rail; band alignment verified optically during AOI inspection |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, and HAST |
| Low leakage (25 nA @ 20 V) | Enables use in precision analog sample-and-hold and low-current bias networks without offset drift |
| Flat-lead thermal design | Reduces junction-to-board thermal resistance by ~25% vs. standard SOD-323, supporting higher IFM derating |
| RoHS-compliant "Green" construction | No intentionally added lead, halogen, or antimony; UL 94V-0 molded compound for flame-retardant safety |
Applications
| Automotive Sensor Interface | Digital Logic Clamping |
|---|---|
Use Scenario: Protecting CAN transceiver inputs from ESD and inductive kickback in engine control units. IC Role / Device Role / Timing Role: Fast transient suppressor placed between LIN bus line and microcontroller GPIO. Use Value: 4.0 ns trr prevents false triggering during 1 Mbps data bursts; 75 V VRRM accommodates load-dump transients up to 60 V. | Use Scenario: Level-shifting TTL outputs to 3.3 V CMOS inputs in industrial PLC backplanes. IC Role / Device Role / Timing Role: Bidirectional clamping diode pair limiting signal swing to safe voltage rails. Use Value: 4.0 pF CT avoids signal distortion on 50 MHz clock lines; low VF maintains logic threshold margins. |
| RF Detector Circuit | Power Supply Sequencing |
Use Scenario: Demodulating AM signals in 2.4 GHz Wi-Fi front-end RSSI monitoring paths. IC Role / Device Role / Timing Role: Zero-bias envelope detector diode in passive peak detection network. Use Value: Sub-5 pF CT ensures broadband response up to 3 GHz; low IR preserves DC output accuracy at µA-level currents. | Use Scenario: Controlling power-up order of FPGA core and I/O banks using discrete OR-ing logic. IC Role / Device Role / Timing Role: Isolation diode preventing backfeed between independent 1.2 V and 3.3 V regulator outputs. Use Value: 500 mA IFM rating handles inrush surges; 0.62 V VF minimizes voltage drop across sequencing path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAT54WS-7-F | Lower VRRM (30 V), higher CT (10 pF), Schottky architecture (no minority carrier storage) | Better for <5 V systems requiring zero reverse recovery; unsuitable for 12 V+ clamping | Select when trr = 0 ns is mandatory and reverse voltage stays below 25 V |
| 1N4148W-7-F | Same VRRM (100 V), slower trr (4 ns typical but not guaranteed ≤4 ns), SOD-123 package (larger footprint) | Acceptable for general-purpose switching where AEC-Q101 is not required | Choose for cost-sensitive industrial designs where automotive qualification is unnecessary |
Compared with BAT54WS-7-F and 1N4148W-7-F, the 1N4448WSF-7 uniquely combines AEC-Q101 compliance, guaranteed ≤4.0 ns trr, and SOD323F miniaturization-making it optimal for space-constrained, high-reliability automotive signal conditioning.
Availability
1N4448WSF-7 is available at Aetrix Electronics and suitable for automotive sensor interfaces, digital logic clamping, RF detector circuits, and power supply sequencing requiring stable component supply across production lifecycles.
Supply support for 1N4448WSF-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The 1N4448WSF-7 belongs to Diodes' AEC-Q101-qualified fast-switching diode product line, engineered specifically for automotive signal integrity, ESD protection, and high-frequency timing applications.
FAQ
What is the maximum junction temperature for continuous operation?
The 1N4448WSF-7 has an operating junction temperature range of –65°C to +150°C. For continuous operation at full 500 mA forward current, derating begins above 25°C ambient per Figure 1; at 85°C ambient, maximum allowable IF drops to approximately 300 mA to maintain TJ ≤ 150°C with RθJA = 313°C/W.
Is the cathode band orientation consistent across SOD323F packaging?
Yes-the cathode band is always located on the same side of the SOD323F package body, aligned with the flat edge of the molded case. Top-view marking shows the band adjacent to terminal "B" (cathode) per Diodes Inc. package outline DS35380 Rev. 3–2, page 4.
Does this diode support reflow soldering per J-STD-020?
Yes-the 1N4448WSF-7 is rated for moisture sensitivity level 1 and qualified for standard Pb-free reflow profiles (peak 260°C, 10-second dwell). Its matte tin finish and copper alloy leadframe ensure robust solderability per MIL-STD-202, Method 208.
How does its reverse recovery performance compare to legacy 1N4148 variants?
The 1N4448WSF-7 guarantees trr ≤ 4.0 ns under defined test conditions (IF = IR = 10 mA, RL = 100 Ω), whereas standard 1N4148W-7-F specifies only typical trr ≈ 4 ns with no maximum limit-making the 1N4448WSF-7 preferable for deterministic timing-critical designs.
1N4448WSF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 75 V
- Current - Average Rectified (Io):
- 500mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 150 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 4 ns
- Current - Reverse Leakage @ Vr:
- 2.5 µA @ 75 V
- Capacitance @ Vr, F:
- 4pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N4448WSF-7 FAQ
1.How can I place an order for 1N4448WSF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4448WSF-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N4448WSF-7 reliable?
The price and inventory of 1N4448WSF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4448WSF-7 is usually 5 days.
3.What payment methods are accepted for 1N4448WSF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4448WSF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4448WSF-7?
1N4448WSF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4448WSF-7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N4448WSF-7?
For technical support, including 1N4448WSF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4448WSF-7 requirements.
6.How does Aetrix verify that 1N4448WSF-7 is sourced from the original manufacturer or authorized distributors?
All 1N4448WSF-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N4448WSF-7 meets industry standards.
7.What is the process for return or replacement of 1N4448WSF-7?
All 1N4448WSF-7 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4448WSF-7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N4448WSF-7 part is unused and in its original packaging.
Return procedure for 1N4448WSF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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